Read this article then you get some basic idea about what can they do and what can you do.!
Forum Permissions
Every forum that exists within can be assigned by various permissions regarding of it's usage. These permissions can be set at this panel. Restriction of the behavior of different types of users on a per-forum basis.
There are ten Permission Types. Each of these types refers to a specific behavior
within a forum.
View - The user may see the forum on the forum index page.
Read - The user may view topics in a forum, and read posts in those topics.
Post - The user may post new topics in the forum.
Reply - The user may post replies to existing topics in the forum.
Edit - The user may edit his/her own posts in the forum. It is not recommended that this be set to "ALL" as it'll allow any anonymous post to be edited by any anonymous user.
Delete - The user may delete his/her own posts in the forum. A post can only be deleted by a non-moderator if it has not been replied to. It is not recommended that this be set to "ALL", because that will allow any anonymous post to be deleted by any anonymous user.
Sticky - The user may make sticky Topics
Announce - The user may make Announcements
Vote - The user may vote in Polls. It is not recommended that this be set to "ALL", because that will allow an anonymous user to vote more than once.
Poll create - The user may create Polls.
Permission Levels
There are five permission levels. A user may be a member of more than one permission level. To be in each of the permission levels:
ALL - Every user in the board is in this permission level. This level is used particularly to grant permissions to users who are not registered and/or logged in.
REG - A user is in this permission level if he/she is both registered at the board, and is currently logged in.
PRIVATE - There are two parts to being a private member of a forum. In the forum permissions, there must be at least one permission type set to the permission level PRIVATE. Additionally, in the User Permissions or Group Permissions panel, the user or group must be "Allowed Access" to the private forum (or have permission types set to "ON" in advanced mode.)
MOD - Someone is in this permission level if they are a moderator of the forum.
ADMIN - Board administrators (and no one else) are in this permission level.
Forum Permissions
Every forum that exists within can be assigned by various permissions regarding of it's usage. These permissions can be set at this panel. Restriction of the behavior of different types of users on a per-forum basis.
Public - Anonymous users can read and post. Registered Users can additionally edit their posts, and create and vote in polls.
Moderators and administrators can make stickies and announcements.
Registered - Anonymous users can read the forum.Registered Users can additionally post, reply, edit their posts, and create and vote in polls.
Registered - Anonymous users can read the forum.Registered Users can additionally post, reply, edit their posts, and create and vote in polls.
Moderators and administrators can make stickies and announcements.
Registered [Hidden] - Anonymous users may only register. Registered Users can read, post, edit their posts, and create and vote in polls.
Moderators and administrators can make stickies and announcements.
Private - Non-Private users may only see the forum. Private Users can read, post, reply, edit their posts, and create and vote in polls.
Moderators and administrators can make stickies and announcements.
Private [Hidden] - Only Private Users may see the forum. Private Users can read, post, reply, edit their posts, and create and vote in polls. Moderators and administrators can make stickies and announcements.
Moderators - Anonymous and Normal users can only see the forum. Moderators and administrators can read, post, reply, edit their posts, create polls, vote in polls, and make stickies and announcements.
Moderators [Hidden] - Normal users cannot see the forum. Moderators and administrators can read, post, reply, edit their posts, create polls, vote in polls, and make stickies and announcements.
Permission Types
There are ten Permission Types. Each of these types refers to a specific behavior
within a forum.
View - The user may see the forum on the forum index page.
Read - The user may view topics in a forum, and read posts in those topics.
Post - The user may post new topics in the forum.
Reply - The user may post replies to existing topics in the forum.
Edit - The user may edit his/her own posts in the forum. It is not recommended that this be set to "ALL" as it'll allow any anonymous post to be edited by any anonymous user.
Delete - The user may delete his/her own posts in the forum. A post can only be deleted by a non-moderator if it has not been replied to. It is not recommended that this be set to "ALL", because that will allow any anonymous post to be deleted by any anonymous user.
Sticky - The user may make sticky Topics
Announce - The user may make Announcements
Vote - The user may vote in Polls. It is not recommended that this be set to "ALL", because that will allow an anonymous user to vote more than once.
Poll create - The user may create Polls.
Permission Levels
There are five permission levels. A user may be a member of more than one permission level. To be in each of the permission levels:
ALL - Every user in the board is in this permission level. This level is used particularly to grant permissions to users who are not registered and/or logged in.
REG - A user is in this permission level if he/she is both registered at the board, and is currently logged in.
PRIVATE - There are two parts to being a private member of a forum. In the forum permissions, there must be at least one permission type set to the permission level PRIVATE. Additionally, in the User Permissions or Group Permissions panel, the user or group must be "Allowed Access" to the private forum (or have permission types set to "ON" in advanced mode.)
MOD - Someone is in this permission level if they are a moderator of the forum.
ADMIN - Board administrators (and no one else) are in this permission level.
